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参数资料
| 型号： | LTC3521IFE#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20 |
| 文件页数： | 9/22页 |
| 文件大小： | 1476K |
| 代理商： | LTC3521IFE#TRPBF |
LTC3521
17
3521fa
APPLICATIONS INFORMATION
Capacitor Vendor Information
BoththeinputandoutputcapacitorsusedwiththeLTC3521
must be low ESR and designed to handle the large AC cur-
rents generated by switching converters. The vendors in
Table 5 provide capacitors that are well suited to LTC3521
application circuits.
Table 5. Capacitor Vendor Information
MANUFACTURER WEB SITE
REPRESENTATIVE PART
NUMBERS
Taiyo Yuden
www.t-yuden.com
JMK212BJ106K 10μF, 6.3V
JMK212BJ226K 22μF, 6.3V
TDK
www.component.
tdk.com
C2012X5R0J106K 10μF, 6.3V
Murata
www.murata.com
GRM21BR60J106K 10μF, 6.3V
GRM32ER61C226K 22μF, 16V
AVX
www.avxcorp.com
SM055C106KHN480 10μF
Minimizing solution size is usually a priority. Please be
aware that ceramic capacitors can exhibit a significant
reduction in effective capacitance when a bias is applied.
The capacitors exhibiting the highest reduction are those
packaged in the smallest case size.
PCB Layout Considerations
The LTC3521 switches large currents at high frequencies.
Special care should be given to the PCB layout to ensure
stable, noise-free operation. Figure 5 depicts the recom-
mended PCB layout to be utilized for the LTC3521. A few
key guidelines follow:
1. Allcirculatinghighcurrentpathsshouldbekeptasshort
as possible. This can be accomplished by keeping the
routes to all bold components in Figure 5 as short and
as wide as possible. Capacitor ground connections
should via down to the ground plane in the shortest
route possible. The bypass capacitors on PVIN1 and
PVIN2shouldbeplacedasclosetotheICaspossibleand
should have the shortest possible paths to ground.
2. Thesmall-signalgroundpad(GND)shouldhaveasingle
point connection to the power ground. A convenient
way to achieve this is to short the pin directly to the
Exposed Pad as shown in Figure 5.
3. The components shown in bold, and their connections,
should all be placed over a complete ground plane.
4. To prevent large circulating currents from disrupting
the output voltage sensing, the ground for each resistor
divider should be returned directly to the small signal
ground pin (GND).
5. Use of vias in the die attach pad will enhance the ther-
mal environment of the converter, especially if the vias
extend to a ground plane region on the exposed bottom
surface of the PCB.
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